Anchor for crown blocks



13 19 Sept L.'A. RAWSON ANCHOR FOR, CROWN BLOCKS Filed Dec. 15. 1926 Zsu4. RAwso/y n0 MA/L ATTORNEY:

-.angles to thefirst-named 'I-beams, and,

' of Flg. 3.

Patent ed Sept. 13, 1927.

UNITED STATES I 1,642,170 PATENT OFFICE.

LESLIE A. RAWSON, O I HOUSTON, TEXAS ASSIGNOB TO EMSCO DERRICK & EQUIP-KENT COMPANY, 01' LOS ANGELES, CALIFORNIA, A CORPORATION OF CALIFORNIA.

- AN CHOB FOB CROWN BLOCKS.

.hpplication filed December 18, 1928. Serial No. 154,570.

My invention relates to an I-beamanchor, The anchor 20, as illustratedbest in Figs.

and it has a particular utility in crownblocks which form a part of oil,well derrick equipment.

In this art the crown-block is placed at the top end of the derrick ofthe well. The crown-block consists of a 'base formed of pairs ofparallel extending I-beams. Suported on the I-beams which form the baseis a pair of I-beams which extend at right WhlCh support the sheaves ofthe ,crownblock. It is essential that the crown-block sheaves be mounteddirectly above the well so that thecables of the traveling block willproperly engage.the sheaves. Ordinarily, the derrick is not plumb, andit is necessary to adjust the crown-block in position.

It is an object of this invention to provide an anchor for attaching theI-beams of the crown-block together, which means permits a readyadjustment of the crownblock sheaves but rigidly secures the I- beamstogether.

Other objects and advantages of the invention will be made evidenthereinafter. I Referring to the drawing in which I illustrate myinvention: I J l Fig. 1 is.a fra entary view showing a crown-block instaed at the top end 0 a derrick, this crown-block utilizing the anchor ofthis invention.

Fig. 2 is an enlarged fragmentary per spfictwe' view showing myinvention in deta' Fig. 3 is a view of the anchor taken as indicated bythe arrow- 30f Fig. 2. Fig. 4 is a bottom plan view'taken as indicatedby the arrow 4 of Fig. 3.

'Fig. 5 1s a section taken on the line 5-5 Referring to the drawing indetail, the numeral 11 represents the upper end of a derrick. Attachedto the derrick 11 are support plates 12 on which I-beams 13 rest, and towhich the I-beams are secured by suitable bolts 14. Resting on theLbeams .13 are I-beams 15 which-extend at right angles to the I-beams13. The I-beams '15 support bearingsv 17 which bearings 17 carry a shaft18 on which sheaves 19 are rotatable. The I-beams 13 and 15 are clampedtogether by anchors 20 embodying the'features of this invention.

2 to 5 inclusive, consists of a yoke 25'. The yoke 25 includes a bridge26 at the oppo-.

site ends of which fulcrum arms 27 are formed. The fulcrum arms 27extend inward below the bridge 26 so as to provide opposing channels 28.The fulcrum arms 27 are provided with upper V-shaped faces 29- whichprovide fulcrum ed es 30.

Extended from the centra part of the bridge 26 at right angles theretois an engager 32. The engager 32 is comparatively,

short and is provided with lower gripping edges 33. Extended from thebridge 26 at the central part thereof, at right angles thereto and in adirection opposite from the extension of the engager 32, is a lever arm.35; The lever arm 35 is considerably longer than the engager 32. At theouter end of the lever arm 35 is a screw 36 which is threaded through anopening 37 formed in the end of the lever arm "35. The screw 36 islocked in the desired position by means of a lock nut 38.

; In using the anchor of my invention it must be slid onto the I-beams13 from the ends thereof. Referring to F ig.- 2, the bridge26 extendsabove an upper flange 40 of an I-beam on which it is placed. The

edges of the flange 40 extend into the channels 28 and the fulcrum arms27 extend beloyv the edges of the flange. Theanchor In. order to clampthe two I-beams together the .lock nut 38 is screwed u ward on the screw36, and the screw 36 is a vanced downward through the opening 37 in theend of.

the arm 35. The lower end of the screw 36 engages the upper face of theflange 40 and moves the end of the lever arm 35 upward.

flheflgri ping edges 33 of the engager 32 rest' on the ange 41 and astheend of the arm 35 is moved upward the fulcrum edges 30 will "engage thelower face of the flange 40. As the end of the lever arm 35 ,is movedfurther', the entire anchor 20 will fulcrum on the fulcrum edges 30.This fulcruming action swings the engiager downward and causes thegripping e ges 33 to tightly grip the flange '41 of the h per I-beam.The grip. of the engager w' 1- be powerful be.-

cause the lever arm 351s much longer than the engager 32 and becauseconsiderable power may be had by reason of the screw 36, The importantfeature of the invention is that it is adjustable into any position onthe lower l-beam 13; therefore, it ermits. the upper I i-beams 1'5 tobesecured in any position, this allowing the sheaves 19 to be centralizedabove the welL. v i

Another featureof the invention is that the anchor cannot be droppedfrom the top 7 end of the derrick unless it is moved from an engagerextended. from said yoke, said engager being adapted to engage a memberfor securing said member to said flange; a lever arm extended from saidyoke; and means engaging said lever arm for moving said yoke and saidengager so that said i engager will gri said member. 2. A combination asdefined in claim 1 in which said fulcrum arms have edges enneaa'irogaging said. flange on which said anchor fulcrums.

3. A combination as defined in claim 1 in which said means comprises ascrew extend from a bridge of said yoke at right.

in opposite direcangles to said bridge and tions. I

5. A clamp adapted. to clamp a primary and a secondary member together,comprise ing: a yoke adapted to engage a portion of said primary member;an engager oh said yoke, said engager being adapted to engage saidsecondary member; a lever arm extending from said yoke; and ad'ustablemeans engaging said lever'arm an said primary member whereby saidengager tightly glamps said secondary member to said primary member. f

6. A combination as defined in claiml in which said engager carriesgripping edges.

'2'. A combination as defined in claim 1 in which said lever arm islonger than said.

engager.

- In testimony whereof, I have hereunto set my hand at Houston, Texas,this 1st day of December, 1926.

LESLIE A. RAWSUN,

till

